An Estimation of Inertia Coefficient of a Horizontal Circular Cylinder in Waves at Low Kc Number

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  • 低Kc数域における波浪中水平没水円柱の質量係数の推定法
  • テイ Kcスウイキ ニ オケル ハロウチュウ スイヘイ ボッスイ エンチュウ

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Abstract

Inertia force acting on a horizontal circular cylinder in waves significantly decreases with in-creasing Kc number at low Kc numbers. The rapid reduction of inertia force is caused by circulating flow around the cylinder. The strength of the circulation around a horizontal cylinder in regular waves is approximately estimated by using a simple vortex shedding model. From this model, it is deduced that the inertia coefficient is given by C_m=2-(2/π^2)Kc^2. The results by this simple formula are in good agreement with experimental ones at Kc less than 2.5. Wave forces acting on a horizontal circular cylinder in irregular waves are also estimated by using the simple vortex shed-ding model.

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